python socket
import socket HOST = '127.0.0.1' # Standard loopback interface address (localhost) PORT = 65432 # Port to listen on (non-privileged ports are > 1023) with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: s.bind((HOST, PORT)) s.listen() conn, addr = s.accept() with conn: print('Connected by', addr) while True: data = conn.recv(1024) if not data: break conn.sendall(data)
python can socket
import socket import struct import sys # CAN frame packing/unpacking (see `struct can_frame` in <linux/can.h>) can_frame_fmt = "=IB3x8s" def build_can_frame(can_id, data): can_dlc = len(data) data = data.ljust(8, b'x00') return struct.pack(can_frame_fmt, can_id, can_dlc, data) def dissect_can_frame(frame): can_id, can_dlc, data = struct.unpack(can_frame_fmt, frame) return (can_id, can_dlc, data[:can_dlc]) if len(sys.argv) != 2: print('Provide CAN device name (can0, slcan0 etc.)') sys.exit(0) # create a raw socket and bind it to the given CAN interface s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW) s.bind((sys.argv[1],)) while True: cf, addr = s.recvfrom(16) print('Received: can_id=%x, can_dlc=%x, data=%s' % dissect_can_frame(cf)) try: s.send(cf) except socket.error: print('Error sending CAN frame') try: s.send(build_can_frame(0x01, b'x01x02x03')) except socket.error: print('Error sending CAN frame')
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